Improvement in grinding-mills



i from the others.

'Uivirnn STATES PATENT- I JOHN A. MOORE, OF PROVIDENCE, RHODE ISLAND.

IMPROVEMENT IN GRINDlNG- MIL LS.

Specification forming part of Letters Patent No; 189,149, dated July 25, 1876; application filed July 10, 1875.

To'all whom itmay concern:

Be it known that I, JOHN A. MOORE, of the city of Providence, State of Rhode Island,

have invented certain new and useful Improvements in Grinding-Mills; and I do hereby declare that the following is a full, clear, and,

exact description of the same, reference being had to the accompanying drawings, forming part of this specification.

Figure l is a sectional elevation, showing the interior of myimproved mill. Fig. 2 is an end View of the same. Fig. 3 is a cross-section, showing the arrangement of the'beaters, the partitions, and the corrugated lining.

My invention has reference to that'class of mills known as disintegrators, in which the material is broken into fine dust by heaters driven at high velocity within a cylindrical means of bolts or other fastening on the other.

d d are chilled iron orsteel corrugated blocks, secured to the cylindrical case 0. Against these the material to be ground is driven by the heaters. E E are partitions secured to the cylindrical case, and projecting inwardly into the same, thus separating each set of heaters The object of these partitions is to prevent the lateral spreading of the material to be ground, and keep thesame in the path of the heaters, and particularly so when the material is to be ground into an impalpable dust, in which case the end neart-he discharge-funnel is more or less raised, as will be more fully described hereinafter.

F F arethe pulleys by. which rotation is imparted to the heaters. g is the inlet-funnel, delivering the material near the center of the cylinder, where the same is caught by the revolving heaters,and thrown violently against the corrugated lining of the cylinder, and is thus broken by percussion. h is the outlet from which the powdered material is forced is a hand wheel or nut, by which the other end of the mill canbe raised or lowered, so as to graduate the fineness of the powder or grain produced.-

The invention consists, first, in dividing the cylindrical case of a disintegrator, by thepartitions E E, into compartments, in each of the funnel g, it is caught by the heaters andacquires a circular motion, and by the centrifugal impulse it is driven with great force agaist the corrugated lining. The curved lines.

of this corrugated lining cause the material to rebound in different directions, for each grain or particle will rebound from the surface against which it is thrown on the same angle as that in which it meets the surface. By using a curved or corrugated surface the particles will rebound in dift'erentdirections, and I are again caught by the heaters. The material to be ground,is thus made to run the gantlet between the heaters and the projections on the corrugated lining, and giving the maximum of violent percussion.

From the first compartment the material is gradually delivered to each of the succeeding compartments until it is forced out of the discharge-funnel at h. When, now, the end of the mill at which the discharge-funnel is located is depressed, the material will be delivered more readily from one compartment to the other, and a larger quantity will be ground in the same unit of time than when the mill is on a level; but the material will not be ground as fine. 1f the end of the mill is, however,

raised, the same will grind still less than when on a level, but such material will be' much finer. By thus raising one end of the 1nill .or depressing it, any degree of fineness may be produced, and always of uniform quality.

In a disintegrator the rapid revolution of the heaters produces avertical air-draft from the inlet-opening toward the exit or discharge FFIGE.

' Patent opening, and the material ground is liable to he carried laterally with the air. By dividing the cylindrical horizontal case into compartments hy the rings or partitions E E, this lateral air-draft is prevented near the periphery of the heaters and cylinder, as the annular partitions or rings project inwardly, as is shown in the drawings, and only the material, passing within the line of the projecting rings or partitions E E, is caught by the air and carried to the next compartment, and heremg'ain subjected to the action of the heater and the corrugated surface until itis finally discharged.

Having thus described my invention, 1 claim as new and desire to secure by Letters 1. In a grinding-mill operating by percus sion and centrifugal force, the horizontal case (3, divided by the partitions E E into compartments, in combination with the shaft 1) and'beaters a a, one set to each compartment, substantially as and for the purpose set forth.

2. In combination with the case 0, divided into compartments by the rings or partitions E E, the corrugated hard-metal lining d, substantially as described. 

